I visited the NIA office in Taipei just today morning, and they let me keep my ARC until I pickup the new one. I didn’t ask if I can keep it or not.
I did not have all the documents with my either, so I was told I can fax them later. The one I was missing was address proof(the address on my ARC is old, I moved about 10 months ago)
So anyway, was quite easy and only took about 15 minutes to get it all sorted out(except the address proof I will fax later today)
I called the NIA today and the women confirmed you can keep your ARC whilst they create the new one, and then exchange the old ARC for the new one when it is ready to be collected. I asked her if it was a new policy, she seemed to think they have always done it that way, but I think she is mistaken.
It’s definitely a new thing.
New Taipei City certainly confiscated (and may still do) the old one routinely while processing the new one.
It seems you can ask them to hold onto it.
Also being allowed to fax in the copy without the original …New.
But if you are travelling overseas you need to be careful to have a ‘live’ ARC.